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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94ea09b690add1a98ee8891b722518c513237c7e6fa51a623019d8045c3743d' 
  AND token = 'QYb/Wwn1jQAV60Td86ejVSH/EWeQ8wHsfWJX0Fy/gRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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