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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e348a494347713cf2548636d38821d0430573af7dc29b0277473ae8099a65d7' 
  AND token = 'pZdXsch4hn3n312h4Yqf8KqUf2QfBZqPAbDJbTIfcJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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