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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '146a26719fa81489ca968691a069c51a5a54c5532298c44b214fa96415d79ad1' 
  AND token = '5BKYNXbc1Qp42HL3mcakIFq0Xy0YJIzOs5oo01dLg8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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