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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '646be7e178e4df965c66fd9d48dbbdbecce8d32fe11f23c56d7a7f4835968cbd' 
  AND token = 'eUD+2aXkva4PFifAm7RtR5G/q9eTA7OQIX7UMtRHT+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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