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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367df2a9ac80332ce1a127cf9782996ef80030db078bd9fd4e239d8ba3f44f5b' 
  AND token = 'yobWstUJ72l8gwbZryRAJR+LG9rCSOXCSUoot9r3K2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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