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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa72c10ef2ef76b96df198018b8877d1d9b74a3f8d0c34f81fc3525ff3de297c' 
  AND token = 'Cfvoo9ozYKOU7dt91O9CShzs6bure2hbEgedJfBCPmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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