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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abeda9240495e8c07c0e33f5cc15ec972592d5a4c50102615e78f9ed3f6ca050' 
  AND token = '9n1r3RaMoHfUrkvOL1FBHrhQYD2es4x639hwGD8uea8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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