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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5a6b609d7f4795e662f1a97ac85ab7a459dbd715efb7bc5c3dfc2768cb32a5' 
  AND token = '7btwMq/ovwv4JzvdntqXm87EfalOLTMo7VF2SfBApKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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