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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef76be0215e61a9ac40c8fa4fafcab72c24930addca0a4ea5ba26b3bef9fcdc' 
  AND token = 'k+2co8Bgak8U5o1hSdeDICah9iPhPcDuwAbfCw90THI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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