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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a158b72ae181278820298bded121d7f9a40c30ce7b1707b48e4bab971fbff18c' 
  AND token = 'YaWohERajVyJKjZolchRcCWxlZ4uKS27NgKZPkL0V/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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