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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55707bd7d53d3f3567157fbdbfd41c29662dfa365bb4cb393e44fb968cd5c7e2' 
  AND token = 'CG/TjF4xajmjZWotQwm1cSw6LrC+qsrWZn96Tk8R7Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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