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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c34cd4093e093854fa6c444e7d8ef82deed46e0be45836b6b22b6a80d816907' 
  AND token = 'IkYaFvPybZtWHxQZh+blVkD29Bo34GXEP9bcwweBxMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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