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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f98843dbcd7df63a722077eb118fe74b026d74b3318641ae29a97ef205c7f6' 
  AND token = 'l/TLyqkNx5A/NDwkuWV1/90Kk5w0EUoaHOrCwdUuZI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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