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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73f19d8ff0f109c707dc61f629cc1c7ccfadd898ade952357b0d5b3f544636f' 
  AND token = 'm+HyUhLG47Z1qPeLhHX876N8pPhawp8tdxAutMoME3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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