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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c182aac7e7d43824edfafa9dafd3f23fccf0f9aa14082709666cd030abdc4767' 
  AND token = 'v5JK6nKhB4sGewe7drOAv7RcHMSOu1u3DFXm7nfi/68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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