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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2d8c57833392dec2f981cbb87b611521233d0da8fbc34fd3b43e73928e40ce' 
  AND token = 'r764pjBhxGMiCeMm6RWmwY5Sc+9qkLpB1heJeWx2Fzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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