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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10a3ea55bff2adaca0d7e597e6c28e74440ca951c44cc63b32b2c9776a3f7b0d' 
  AND token = '3t7QOu2druhnFLJsldmCwCcEQ6VdCVTHbpf8t/j6FCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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