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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71b82978d05821b6ffe3836f91619863d10a1ea35d36638d3ead8da9cc409d7' 
  AND token = '8aoayb0jNW+ruVLjCfjJDgtcat9UPMOQ0SBFPAILiWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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