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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69fe799fc8ca74f079329d26c3d7bb95d95c043ecdfe73c767571c89d77f923' 
  AND token = 'H7j7KwBa3CRZ3vofBiDql/6mcgtTQKyAnv/npLfkRyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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