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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f57b8434c10a9ba7cba87ee71b003e10281e54223f3e3162f74a665b8bf6db6' 
  AND token = '9N708p+Tk8HL6gaLxjgS75pbGYMi/wAgp+lKb3wbtus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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