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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8be1c2217c34f735ee8d638115dc3a78cebc9f2b2537eb2cfd77200cad863f13' 
  AND token = 'v6+uiI7uMQ+eFsuEDH+9imbBskPkYGAHxjdTtg8Lh14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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