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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2bf2ebd5314d642f2a5f9de9f283a49fb32f106cc56d2f78f205a92a7e4bde' 
  AND token = 'nrLiI7/bojzm0FQojhXrsX/pB+ONClLefoyOns3t4TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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