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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb5efb7d0f48b1157e60100ec4e67e97f9937c32816a0bfa83f24614124ab43' 
  AND token = 'wW9hHLCILbvSeHj5Usj4nVVZ2qTmvDH4aX1SIAc88DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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