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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f026bde5c7dfdaab80bfdfda14fad4cefa9e09f2f56a562ac48fd360fb4f4b01' 
  AND token = 'HkSdpzzH1+lLfwfSbgz6yZjOsfP1YJZ9VKzGKc9FDo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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