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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd2ea79d4f5814af7c19b17eb572d0bf41bbda23f585d4b3fca37c22cf5560a' 
  AND token = 'n/P7rrwgglDeUFTIOKyQSd1vPfIhUg2bVJVmF2Rzj8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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