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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a4e8a59fd7bcf4fdf2ec26b174504887b0f7eb46cff3c6ee65ceb1c05acba6' 
  AND token = 'QgeROwihfuS0+xrHi0LTKUtllt1U7I/AR6OMtawA6zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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