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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d18aacc009f4b21c95cb4e26e6d0219b83d66e14b6af7c371cf3a9bfd1ae933' 
  AND token = 'QID85q+gmLQCHHFatg+mR2EaJH6OOnkg59DoSJ/weWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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