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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd52eb04c8eaeedbac2395f2a8e4c16fcff8ceeb93f1e80165e62bd93bca7b90' 
  AND token = '/e1oB9r8RsZfXEku3pfcslMVGltGlHkEwrmMPvUmWRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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