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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7c96be5755e8cdc6e2dbec77dedd79d5f22efeed13233d9fe2f0f5a7615d8b' 
  AND token = 'vDOP92DAFk6Sc+NtBPAjNB1JNKI/He9NV3nlaJjE/BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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