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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4dc9c39cee83aabc83ff03af7677566c5114a0b0ba83eafea9746f3045a29dc' 
  AND token = 'vOxIwfiZe9gekTC0GPtRZr8i6lH+YDUCKWAaC+lHFbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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