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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc3fa7c8f65b73e93d7622428ef0b65c4bb14a28b0d59bfe4be9d0b16008de1' 
  AND token = 'kBnE3BwMpxYpAojkRN5MFAZxDoJGuDwFUOFOWACPMdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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