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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '535370b6e3ed9efae17b61257dc3bffe681f699b9f34a62b6d542454aba2a9e6' 
  AND token = 'ANEeJXIynkP20w2h2QOEAY2RgMQLCYCo2QwQoYxZCdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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