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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '482565714012df63fc652bf0c5438cc83fe4381c9ea5703f7f073f06dab90846' 
  AND token = 'EGT8IGm4JFlbH1VhIa2mSLLLcq6z1tHKPnUwR3F0fGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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