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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb972933cf7042a46dafee70eb7e2d60e7663f380a745c224eeb170271ea9e4' 
  AND token = 'E6+lvbEaZFB7ZMaxIhSx3PTus7pA1hx8Jvblkqri8o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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