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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d390483a33d41817f4c4d9b47f283003502fab391f902fa0a98f4f1eedc50f' 
  AND token = '3wre1unwR8wHEdhe6IPUQCyey4NZTeX5x7qcSwrNIuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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