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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f5524ecf49bf2f441ddd83b259efbe73ca43444bc5428a340978452256f94b' 
  AND token = 'i97eWKldIpuNOW358yASBAL2tW3Ro/AXHxQjdaQFX38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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