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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddcfbd2b828e9e93e92d81fd174364d7d28ee64dd0366e795594932e190f58a4' 
  AND token = 'F8pn7asJGvQdmiZSK7PGsBnAT5xUSMbnRZxSScqzQEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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