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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc3d111b76d4078cf86814e70cabbeee7f866f550aeea7f687a0ef6bb3906ba' 
  AND token = '/MvGRbQ3Kvg8Nu+f2q4MipqPWVlqKyErva/mAYv6tBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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