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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bffd6b837e35a629be1b010d3d0e527f08ac2ce15f12d74924ce78a3e8c1e365' 
  AND token = '7aAUFKR2ccxoc4odu6dcwmDVqIDV/ai7SQFqWjxBnQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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