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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6616dfd5fa3742554ea59e5f0bd6ba5aae8aaf1cd9c2439d63acd95f40575671' 
  AND token = '6p4o3dnvgwyL2ljkW6ME6qKMdIMNyaZJ+IOWunuV9pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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