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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c5a8253503781cddaae9093b2d28471c69dd62b5b3cfedc681c0d7a011495a' 
  AND token = 'V7Mvg/493jDMNrV9AfcKuGEo/M4P7vknFOQyssXcq38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}