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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95486170e4f35f25c63857596d4c2e1fa19c90fc273ac4785d54a930d77ed6f0' 
  AND token = 'j6UJZJHD2ftY2MQ8nkvpXS+CguGSajk6AyL29btCwAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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