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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c7da7b9e7432477da9965f75f3181b59cbf919b4d1fdadd42bfb4ed850c46d3' 
  AND token = 'cL3LZKqCk6N+QOnPqIEX3QJCTK7rRZnxAsQ6RZAHUSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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