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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027bea9310a46ab135a2aef72e68c3510cfe9dd0c02dcc796b30a13a5f407d7d' 
  AND token = 'wqzD/vMEHH0jHlMfN6aqhSEDvG/aiK+at2MjDzdbB8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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