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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b185bb5b1babf9979fbb501e9b03d90372f155502c2bfa8ab87f29ce279b28' 
  AND token = 'v5BkPmkEkIxHdrjRo6QX4vofm10VPeAtm6TiZb5YsfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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