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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e34471c09613154fcd2f6812c9f1af3856b38f0b5e997bbb110958d8c8c076' 
  AND token = 'CBGRG4nnZc2d+PwSnQP6oFTkwHn3kqXr46wJWM7/T9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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