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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7b9931d781e3d5c785812ff6bc47ce507a35fc7c060c68877d2e52f43c3f6d' 
  AND token = 'rsax2D3DUOOSYGAxRwDUwfqNsqfT+yD4Wf2KaQmSZ9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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