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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e669c3715aee98322d2e8b0dda84875c83f5ce6b62970aa42a0ff03938886f2' 
  AND token = 'UVsMIrgkznC5sCWzlTl0Y/xFwr+92adSj3/LJSv6/Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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