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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0618a890b8f3e8b9fc1324a93a08b7cebbc9d47190eb93c849a4b2ee254ccc1' 
  AND token = 'jhyGmldW/1qazJ758SzM4oYuy7Xh/mtj6s6q0IhY4Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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