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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97d7d4e636d9ac0083f33159cd3db37de822b43ca9354fe0609c383fcc7363d' 
  AND token = 'o+ezoLysvJst8ryYSrNxHwtjuldRBhi53pZbvL2ikBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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