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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b824c2b5d0148cb4f11c404a6229115f4e194dbf2755da20938002683b59a767' 
  AND token = 'NAfYPYqcxD0ZP6K95jTtFoL6xrNocMFVkWHAhN9eT9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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