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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd753c8d26ae0b631240ed29c8d33386b6fc75d3edd34892a6efacaa0f71a7d' 
  AND token = 'RlcHXX4+XmFp8Wa6v5bpcZShXvfiACMlzKfQ5sfsP4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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