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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba27408b83f4cde4b9c1e77ba60500d9c5368149664a23a005709d93d7f7e06' 
  AND token = '6IJocPwAY6Z/iKyje/NQkAGnVKMitPJz9Fk4qm6qpSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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