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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee506059cbe855cde2b271e287be8a408bb1e6d88009b2b671da07edd3e4a7b' 
  AND token = 'vNVeBgTWqeXje778TAARZkMNXLc983EcFOgimH58vpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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