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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73461ddaf97e4280995f4c05e54a9bf409d185b7f96d2a7c274d637cc716e8e3' 
  AND token = '2hNsXlP48VFkY95nc6GOw2R/sBvgTNT1cnL22oUqTqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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