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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1071a4f8f9d2aba12b30a445c8f9cab36d4e7cd0a218bcf59a646499ba154a8b' 
  AND token = 'eCDU1izVFvWHtU2dR2EQTaz6IPKw6Es8eiLMmrv6xe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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