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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8ccc024a76c2d82f4cbdc37bfdacfa36ef3cf623de0f2a7d8c609ee3742e3d' 
  AND token = 'YPBjZpeMJtzisqpeTXULWrXstMCsPAfVyVUHL7wc7J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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