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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9527eb63c4c4d1b4aede980b24c2db2b8bb79d99bbeebc1711551604e34ce4a' 
  AND token = 'rrqkpdGTZ/EnhZAe6i1y59Qav1sxp2xi/tuGoxhKfgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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